Multi-axis fatigue testing clamp of high-cycle fatigue testing machine

Abstract

The invention provides a multi-axis fatigue testing clamp of a high-cycle fatigue testing machine. The multi-axis fatigue testing clamp comprises two relative clamp bodies, wherein a clamping end of the rear part of each clamp body is composed of an extending main shaft and an extending sleeve; an inner thread is arranged in the front end of each extending main shaft and is matched with an outer thread of the rear part of a connection shaft at the rear end of an arc-shaped clamp; an inwards concave surface of the front end of the arc-shaped clamp is provided with a plurality of locking devices which form different angles with the vertical direction; the structure of each locking device is as follows: the inward concave surface of the arc-shaped clamp is provided with a lug boss with a blind hole; a conduction cushion block is arranged in the blind hole; a test sample connection block covers the conduction cushion block, and a limiting tooth of the test sample connection block is matched with a limiting groove in a tabletop of the lug boss; an annular groove adapted with the side wall of a locking cover is formed in the periphery of the lug boss; the locking cover covers the test sample connection block and the locking cover is connected to the lug boss through a thread; a locking cover is provided with a through hole; and the test sample connection block is provided with an inner thread through hole. The clamp is matched with the single-axis high-cycle fatigue testing machine to be tried, and can be used for carrying out high-cycle and multi-axis test researches on a test sample.

Description

technical field [0001] The invention relates to a fatigue test fixture of a high-cycle fatigue testing machine, in particular to a multi-axis fatigue test fixture of a high-cycle fatigue testing machine, and belongs to the technical fields of machinery and materials. technical background [0002] Many parts and components in modern engineering work under cyclic loads, such as crankshafts, connecting rods, blades, railway bridges, wheels, nuclear reactors and power generation equipment, etc., and the failure mode is mainly fatigue fracture. For the convenience of analysis and research, fatigue is divided into two types according to the number of failure cycles, low cycle fatigue and high cycle fatigue. The stress level acting on parts and components is relatively high, and the number of failure cycles is generally less than 10 4 ~10 5 The fatigue is called low cycle fatigue; on the contrary, the stress level acting on parts and components is low, and the number of failure c...

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Problems solved by technology

[0004] Patent 200610112809.9 discloses a cross-shaped electric welding sample multi-directional fatigue loading fixture device, which realizes the multi-directional cyclic loading fatigue test fixture for the cross-shaped spot welding sample, but the patent has relatively large limitations on the requirements of the sample. Standard specimens, and can only perform tension-shear cycle multi-directional fatigue tests

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